Question 1

Which of the following best describes the primary goal of the light-harvesting reactions in photosynthesis?

Accepted Answer

To trap sunlight energy and store it as chemical energy in ATP and NADPH

Question 2

Where do the light-harvesting reactions of photosynthesis occur within the chloroplast?

Accepted Answer

On the membranes of the thylakoids

Question 3

Light exhibits properties of both a wave and a particle. Which term is used to describe a particle of light?

Accepted Answer

Photon

Question 4

Visible light is a narrow band of the electromagnetic spectrum. Which of the following best describes the relationship between wavelength ($$\lambda) $$and energy?

Accepted Answer

Energy decreases as wavelength increases

Question 5

Which equation correctly relates the frequency ($$f) $$and wavelength ($$\lambda) of $$light to its speed ($$c$$)?

Accepted Answer

$$c = f 	imes \lambda$$

Question 6

Photosynthetic pigments absorb light energy, which excites electrons. What is the fate of this excited electron in the reaction center?

Accepted Answer

It is transferred to an electron acceptor, resulting in oxidation of the reaction center and reduction of the acceptor

Question 7

Johnny is growing tomatoes under different colors of light. Under which color will his tomatoes grow the poorest, and why?

Accepted Answer

Green, because chlorophyll reflects green light rather than absorbing it

Question 8

Which process describes the transfer of energy from one chlorophyll molecule to another within the antenna complex?

Accepted Answer

Resonance energy transfer

Question 9

Why is ATP not considered a good long-term energy storage molecule in cells?

Accepted Answer

ATP is unstable and cannot be stored efficiently

Question 10

Which of the following is NOT another name for the light-harvesting reactions?

Accepted Answer

The Calvin Cycle

Question 11

A student claims that all visible light is absorbed equally by photosynthetic pigments. Which evidence contradicts this claim?

Accepted Answer

Plants appear green because they reflect green light, indicating poor absorption of green wavelengths

Question 12

Which of the following best explains the concept of 'excited electron' in photosynthetic pigments?

Accepted Answer

An electron that has absorbed energy and moved to a higher energy state

Question 13

Which of the following is a correct sequence of energy conversion in the light-harvesting reactions?

Accepted Answer

Light energy $$\rightarrow$$ Chemical energy (excited electron)

Question 14

Which of the following is true about the Calvin Cycle?

Accepted Answer

It is also known as the Calvin-Benson Cycle and occurs independently of light

Question 15

If the frequency of visible light is $$6 	imes 10$$^{14}$$ Hz and the speed of light is 3$$ 	imes $$10^8 m/s$$, what is the wavelength ($$\lambda) of $$this light?

Accepted Answer

$$\lambda = \dfrac{3 	imes 10^8$}{6 	imes 10$$^{14}$$} = 5 	imes 10$$^{-7}$$ m

Question 16

Which of the following is a real-life application of resonance energy transfer in photosynthesis?

Accepted Answer

Energy transfer between antenna complex chlorophyll molecules to the reaction center

Question 17

During the light-harvesting reactions, which molecule acts as the initial electron acceptor after the reaction center is oxidized?

Accepted Answer

Phaeophyton

Question 18

Which of the following best explains why plants appear green?

Accepted Answer

They reflect green light and absorb red and blue light

Question 19

Which of the following is a correct statement about the electron transport chain in photosynthesis?

Accepted Answer

It is part of the light-harvesting reactions and involves transfer of electrons through a series of proteins

Photosynthesis: The Light-Harvesting Reactions (Part 1) – Structure and Function

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